In a pan, sauté leeks in a bit of oil over medium-high heat for 3 to 4 minutes.
In a bowl, mix the mashed potatoes, leeks, egg and spices. Adjust seasoning if necessary.
Form patties (maakouda) with about 60 ml (1/4 cup) of the preparation.
Put the flour on a plate, coat the maakouda generously in the flour and shake off the excess.
In a large pan, heat 5 ml (1 teaspoon) of canola oil over medium-high heat.
Fry patties for 1 to 2 minutes on each side. Keep warm on a paper towel.
Mix the labneh (or Greek yogurt) and the zaatar.
Serve maakouda with sauce and lemon wedges.